- cyclic impedance
- cyclic magnetization
- cyclic permeability
- cyclic rating
- cycloidal pendulum
- cyclometer
- cyclotron emission
- cyclotron frequency
- cyclotron resonance
- cyclotron wave
- cylinder
- cylinder clearance
- cylinder heating
- cylinder superheat
- cylinder unloading
- cylinder valve
- cylindrical capacitor
- cylindrical cavity
- cylindrical coordinate
- cylindrical ice
- cylindrical reflector
- cylindrical rotor
- cymometer
- Czochralski method
- daily variation
- Dalitz plot
- Dalton" law
- daltonism
- damage
- dark adapter
- dark line
- darkening
- data logger
- dazzlement
- dead load
- dead wall
- deadman switch
- Debye effect
- Debye potentials
- Debye theory
- decayed
- decibelmeter
- decision value
- decolorant
- decompose
- decontaminant
- decreasing temperature
- deep-frozen
- deflagration wave
- deflection plate
- defrost actuation
- defrost light
- defrost termination
- defrostation
- defrosting coil
- defrosting gas
- defrosting period
- defrosting spray
- defrosting time
- degassing
- degausser
- degaussing control
- degree Reaumur
- degree Twaddle
- dehumidification requirements
- dehumidifying capacity
- dehumidifying effect
- dehumidifying machinery
- dehydrating equipment
- dehydration conditions
- dehydrator capacity
- deice
- deicing control
- delayed freezing
- delayed impulse
- damp infiltration
- damped
- damper blade
- damper slide
- damper winding
- damping
- damping winding
- daraf
- dark radiation
- data reconstruction
- datum plane
- daughter
- dead
- dc amplifier
- dead room
- Debye length
- decade counter
- decay
- decay chain
- decomposition reaction
- decomposition voltage
- deenergization
- deep-freezing
- damp heat
- damp location